Step * 2 2 of Lemma fdl-1-join-irreducible


1. Type
2. Point(free-dl(X))
3. Point(free-dl(X))
4. ↑fdl-is-1(y)
⊢ ↑fdl-is-1(x ∨ y)
BY
(Subst' x ∨ y ∨ x ∈ Point(free-dl(X)) THENA Auto) }

1
1. Type
2. Point(free-dl(X))
3. Point(free-dl(X))
4. ↑fdl-is-1(y)
⊢ ↑fdl-is-1(y ∨ x)


Latex:


Latex:

1.  X  :  Type
2.  x  :  Point(free-dl(X))
3.  y  :  Point(free-dl(X))
4.  \muparrow{}fdl-is-1(y)
\mvdash{}  \muparrow{}fdl-is-1(x  \mvee{}  y)


By


Latex:
(Subst'  x  \mvee{}  y  =  y  \mvee{}  x  0  THENA  Auto)




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